Urushiol
noun
1.
a toxic, liquid, catechol derivative, the active irritant principle in several species of the plant genus Rhus, as in poison ivy.
noun
1.
a poisonous pale yellow liquid occurring in poison ivy and the lacquer tree
urushiol u·ru·shi·ol (u-rōō’shē-ôl’, -ōl’)
n.
A toxic substance constituting the active allergen of the irritant oil present in poison ivy, poison oak, and poison sumac.
urushiol
(-r’shē-ôl’, -ōl’)
A toxic substance present in the resin or on the surface of plants of the genus Rhus (syn. Toxicodendron). Urushiol is a mixture of several derivatives of catechol and is the irritating substance in poison ivy.
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